package com.ruoyi.system.wxService;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;

public class SignUtil {
	private static String token = "thskDeviceDemo20211111";

	/**
	 * 校验签名
	 * @param signature 签名
	 * @param timestamp 时间戳
	 * @param nonce 随机数
	 * @return 布尔值
	 */
	public static boolean checkSignature(String signature,String timestamp,String nonce){
		String checktext = null;
		if (null != signature) {
			//对ToKen,timestamp,nonce 按字典排序
			String[] paramArr = new String[]{token,timestamp,nonce};
			Arrays.sort(paramArr);
			//将排序后的结果拼成一个字符串
			String content = paramArr[0].concat(paramArr[1]).concat(paramArr[2]);

			try {
				MessageDigest md = MessageDigest.getInstance("SHA-1");
				//对接后的字符串进行sha1加密
				byte[] digest = md.digest(content.toString().getBytes());
				checktext = byteToStr(digest);
			} catch (NoSuchAlgorithmException e){
				e.printStackTrace();
			}
		}
		//将加密后的字符串与signature进行对比
		return checktext !=null ? checktext.equals(signature.toUpperCase()) : false;
	}

	/**
	 * 将字节数组转化我16进制字符串
	 * @param byteArrays 字符数组
	 * @return 字符串
	 */
	private static String byteToStr(byte[] byteArrays){
		String str = "";
		for (int i = 0; i < byteArrays.length; i++) {
			str += byteToHexStr(byteArrays[i]);
		}
		return str;
	}

	/**
	 *  将字节转化为十六进制字符串
	 * @param myByte 字节
	 * @return 字符串
	 */
	private static String byteToHexStr(byte myByte) {
		char[] Digit = {'0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'};
		char[] tampArr = new char[2];
		tampArr[0] = Digit[(myByte >>> 4) & 0X0F];
		tampArr[1] = Digit[myByte & 0X0F];
		String str = new String(tampArr);
		return str;
	}

}
